1997-08-29 00:52:03 +00:00
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/* Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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1997-11-26 04:14:44 +00:00
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#ifndef _SYS_POLL_H
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# error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
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#endif
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1997-08-29 00:52:03 +00:00
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/* Event types that can be polled for. These bits may be set in `events'
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to indicate the interesting event types; they will appear in `revents'
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to indicate the status of the file descriptor. */
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#define POLLIN 0x001 /* There is data to read. */
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#define POLLPRI 0x002 /* There is urgent data to read. */
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#define POLLOUT 0x004 /* Writing now will not block. */
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#ifdef __USE_XOPEN
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/* These values are defined in XPG4.2. */
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# define POLLRDNORM 0x040 /* Normal data may be read. */
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# define POLLRDBAND 0x080 /* Priority data may be read. */
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# define POLLWRNORM POLLOUT /* Writing now will not block. */
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# define POLLWRBAND 0x100 /* Priority data may be written. */
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#endif
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/* Event types always implicitly polled for. These bits need not be set in
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`events', but they will appear in `revents' to indicate the status of
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the file descriptor. */
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#define POLLERR 0x008 /* Error condition. */
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#define POLLHUP 0x010 /* Hung up. */
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#define POLLNVAL 0x020 /* Invalid polling request. */
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/* Canonical number of polling requests to read in at a time in poll. */
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#define NPOLLFILE 30
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